代码语言：javascript复制一、启动虚拟机Connection reset by peer
# virsh start vmhost1error: Failed to start domain vmhost1error: Unable to read from monitor: Connection reset by peer在虚拟机运行过程中关闭宿主服务器就有可能导致这种情况出现，由于宿主服务器中的kvm虚拟机控制器与安装在kvm中的虚拟机会话被异常重置，所以我们可以如下解决：
代码语言：javascript复制# virsh managedsave-remove vmhost1# virsh start vmhost1如果启动查看/var/log/libvirt/qemu/vmhost1.log下log还报如下错误：
代码语言：javascript复制Cannot set up guest memory 'pc.ram': Cannot allocate memory这个问题可能是分配给vmhost1分配的内存过大（甚至超过的物理主机的内存大小），或者可能是宿主机没有足够的内存分配给此虚拟机，导致无法启动！
代码语言：javascript复制二、重Define虚拟机时无/usr/bin/kvm
error: Failed to define domain from hostname.xmlerror: Cannot find QEMU binary /usr/bin/kvm: No such file or directory解决方法：
代码语言：javascript复制# ln -s /usr/libexec/qemu-kvm /usr/bin/kvm代码语言：javascript复制三、error: internal error process exited while connecting to monitor
# virsh start vmhost1 error: Failed to start domain vmhost1error: internal error process exited while connecting to monitor: kvm: -drive file=/dev/sp1368155439693/v1368544020461,if=none,id=drive-virtio-disk0,format=qcow2: could not open disk p_w_picpath /dev/sp1368155439693/v1368544020461: Invalid argument分析：镜像格式错误，用qemu-img info 检查镜像和xml配置文件中指定的type是否一致！
代码语言：javascript复制四、Unable to load library 'virt': libvirt.so
Unable to load library 'virt': libvirt.so: cannot open shared object file: No such file or directoryLinux下解决： ln -s /usr/lib/libvirt.so.0 /usr/lib/libvirt.so
windows下解决：
将libvirt-0.dll改名为virt.dll代码语言：javascript复制五、error: Refusing to undefine while domain managed save p_w_picpath exists
# virsh undefine vmhost1error: Refusing to undefine while domain managed save p_w_picpath existshttp://www.redhat.com/archives/libvir-list/2011-July/msg01219.html解决方法：virsh undefine $domain --managed-save
代码语言：javascript复制六、启动libvirtd进程出错
# /usr/local/sbin/libvirtd -d -l --config /usr/local/etc/libvirt/libvirtd.conf （编译安装的启动方式）error：/usr/local/sbin/libvirtd: initialization failed
try to install libpcap-devel RPM and rebuild libvirt http://comments.gmane.org/gmane.comp.emulators.libvirt/58218apt-get install libpcap-dev
上面的方法好像都没有效果，但是尝试了http://wiki.libvirt.org/page/The_daemon_cannot_be_started说的，把配置文件里的
listen_tls = 0注释取消（更奇怪的问题，在我的客户端链接不对）代码语言：javascript复制七、启动虚拟机报错
# virsh start vmhost1error: Failed to start domain vmhost1error: internal error process exited while connecting to monitor: Could not access KVM kernel module: No such file or directoryfailed to initialize KVM: No such file or directoryNo accelerator found!上面的提示信息就是因为QEMU在初始化阶段因为无法找到kvm内核模块。
代码语言：javascript复制# modprobe kvm #载入指定的模块重启电脑，进入bios界面，设置advance选项里面的virtualization标签为Enabled
代码语言：javascript复制通过命令 lsmod | grep kvm #显示已载入的模块代码语言：javascript复制八、虚拟机迁移
# virsh migrate --live 1 qemu tcp://192.168.0.121 --p2p --tunnelled --unsafe error: operation failed: Failed to connect to remote libvirt URI qemu tcp://192.168.0.121（在URI后面加上/system，‘system’相当于root用户的访问权限)
#virsh migrate --live 2 qemu tcp://192.168.0.121/system --p2p --tunnelled
error: Unsafe migration: Migration may lead to data corruption if disks use cache != none（加上--unsafe参数）#virsh migrate --live 2 qemu tcp://192.168.0.121/system --p2p --tunnelled --unsafe error: Timed out during operation: cannot acquire state change lock (启动虚拟机有时也会遇此错误）,需要重启libvirtd进程代码语言：javascript复制九、virsh
error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Connection refused(libvirtd 进程没有启动，libvirtd是一个监听客户端请求的进程）# virsh -c qemu:///system listerror: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Permission denied
error: failed to connect to the hypervisor
（当前用户没有权限，修改/etc/libvirt/libvirtd.conf,unix_sock_rw_perms = 0777,使所有用户都有权限读写）转：http://openskill.cn/article/146
